Electric polishing machine



L. CRANE ELECTRIC POLISHING MACHINE Feb, 26, 1929 1,703,815

Origxi-nal Filed June 16, 1923 J] 0? jg .1 J

I .24 Q I N t 2 1% EE- L avwesdoz 3% V TZ Patented Feb. 26,1929.

*U ST PATENT OFFICE. 1*

LESLIE CRANE, or RUTLAND, VERMONT, .essro'non or ONE-HALF To run.'rn'ren MAN FACTURING COMPANY, or VERMONT.

ltUTLA ND," VERMONT, A CORPOBATIQH Oil ELECTRIC rousnine mcnmn Originalapplication filed June 16, 1923, Serial No. 645,828. Divided and an!application. nee June a,

. r v 1924. Serial Io. 717,490., e

This invention relates. to certain new and useful improvements inelectric polishing machines and more particularly to that type ofmachine in which a swinging arm. is

mounted on a vertical standard carrying a polishing disc, and is adivision of my application Serial Number 645,828, filed JunelG, 1923,the object being to provide means for mounting the head.

A further object of the invention is to provide a polishing machine inwhich a central standard is mounted rigidly within .abase and hasmountedthereon a head carrying an electric motor.

A still further object of the invention is to provide a construction ofpolishing machine in which the working parts are enhoused so as toprotect the same from grit and dust, thereby increasing the life of themachine. e I

In the drawing Ihave shown a vertical section of my improvedconstruction of standard for a polishing machine comprising a base (notshown) having an upwardly'extending reinforced portion2 having a tubu-'lar bore 3 into which is driven a tubular standard 4 and secured by pins5' as clearly 7 shown in the drawing. Driven into the top of thestandard 4 isa socket 6'provided with a shoulder 7 bearing on the upperend of the standard4 as clearly shown. The socket 6 is annularly reducedas shown at 8 into which is secured a sleeve 9 forming with the socket 6an annular chamber 10 into which is adapted to extend a'tubular portion11 of a head 12, said tubular portion being provided with openings 13.The lower end of the tubular portion is mounted on ball bearings 14within the bottom of the chamber 10 which is adapted to receive alubricant forikeeping the bearings lubricated at all times.

Bolted to the-head 12 is a collar 15 provided with an arm 16 adapted tosupport an electric motor. A collar 15 carries an arm 22 provided with abearing 21 and a sleeve 23,

which has its lower end arranged within a collar 24 having an annularextension 25 which extends into a' cup 26 formed on the upper end of theextension of the base and in which are arranged roller bearings 27,saidcollar having a hood 28 extending down over the cup portion forprotecting the same. The collar 24 is provided with an arm 29 having asocket 3O atits outer end.

parts, the, machine isbalanced.

The construction thus far described forms the main standard on whichthehead is revolubly mounted carrying the motor and drip ing shaft sothat the swinging. sectional arm of machines of thi's'kind will swing asthe weight is "not equally distributed in- View of the length. of thesectional arm, it is desirable to provide means for taking care of theside thrust, which I have accom lished and by the particular manner ofmounting the The head 12,'c'oll ar 15, sleeve 23 andcollar 24 constitutewhat I have termed a body,

which is rovolubly mounted on the standard on ball bearings so that thesame. can swing around the standard. freely, the sleeve 23 constitutinga guide on which the tubular portion of the working arm is slidablymounted.

What I claim is z 1. In a polishing machine, the combination with a basehaving a vertical tubular standard fixed therein, of a socket arrangedin the upper end of said standard having an annular shoulder'resting onthe upper edge of said standard, a sleeve fixed in said socket formingan annular chamber, a head having an apertured tubular portion extendinginto said chamber with its outer wall in contact with the outer wall ofsaidchamber and ball bearings disposed in thebottom of said chamber uponwhich the' lower end of'said tubular portion of said head is mounted anda sleeve carried by saidhead extending downwardly around said standard.

2. In a polishing machine, thecombination with a fixed vertical tubularstandard, of a socket'having an annular reduced portion secured in theupper end of said standard, a sleeve secured in the reduced portion ofsaid socketjforming an annular oil chamber, ball bearin s disposed inthe bottom of said chambet, a ody surrounding said standard providedwith a head having a dependin tubular portion extending to said cham erand mounted upon said bearings and a bearing carried by the standard forthe lower end of said body. 2 r

posediinthe bottom of said chamber, a body provided with a head having adepending apertured tubular portion extending into said chamber andfitting the outer Wall snugly the'reof, the lower end of said tubularportion being mounted on the bearings Within said chamber said bodybelng provided wlth a tubularportion surroundmg said standard and abearing carried by the standard for the lower end of the tubular portionof said body. 4. In a polishing machine, the combination with a' 'fixedvertical standard having an annular oil-chamber at its upper end,abearingarranged in the bottom of said chamber of abody surroundingsaidstandard having a head mounted on said standard anda downwardlyextending apertured tubular portion carried by said head extending intosaid chamber having its lower end mounted on the bearings therein'andhaving its outer Wall in "contact with the outer Wall of said chamberandabearing carried by the standard for the lower end of said body.

In testimony whereof I hereunto aiii my signature.

LESLIE RANE.

